| Assessment Questions: 53 results |
Solutions : FreezePtDepression (20 Variations)
It takes 6.86 kg of ethylene glycol (antifreeze) to decrease the freezing point of 6.50 kg of water to -25.0oF (-31.7oC). How much sodium chloride (NaCl) would it take to decrease the freezing point of 6.50 kg of water to -25.0oF? (Assuming all the salt will dissolve in that amount of water.)
Solutions / Solvents
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Solutions : GeneralSolutions (10 Variations)
You have 500.0mL of 0.100M aqueous MgBr2. Which of the following statements are true?
Solutions / Solvents
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Solutions : SolnPrepProcedure (10 Variations)
You want to prepare 250mL of a 0.0150M solution of KCl. Which of the following procedures would give you the best results?
Solutions / Solvents
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Solutions : SolutionNanoPics (4 Variations)
The drawings below represent flasks of aqueous solutions. Each pink dot represents a dissolved solute particle.
Which of the following solutions is most concentrated?
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500 mL
Solution A
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500 mL
Solution B
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500 mL
Solution C
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250 mL
Solution D
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250 mL
Solution E
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250 mL
Solution F
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Solutions / Solvents
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Solutions : IonConcentration (4 Variations)
Which of the following solutions has the greatest concentration of Na+ ions?
Solutions / Solvents |
Chemometrics
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Solutions : MassSoluteInSoln (10 Variations)
What is the mass of the solute in 500mL of 0.341M ammonium chloride?
Solutions / Solvents |
Chemometrics
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Solutions : RelativeConc (4 Variations)
What are the relative concentrations of the ions in 0.10 M aqueous sulfuric acid?
Solutions / Solvents |
Stoichiometry
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Solutions : ReverseOsmosis (20 Variations)
You are given a water sample that contains ammonium chloride (NH4Cl). You determine the concentration of the salt to be 0.500 M and decide to purify the water using reverse osmosis. What is the minimum pressure that must be applied at 30.0oC to force the water through the membrane?
Solutions / Solvents |
Transport Properties
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Solutions : SolnConcAfterMixing (4 Variations)
10 mL of 0.1 M BaCl2(aq) is mixed with 10 mL of 0.1 M AgNO3(aq). What are the concentrations of the ions in the final mixture?
Solutions / Solvents |
Chemometrics
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Solutions : SolnPrepByDilution (10 Variations)
For the analysis of trace metals it is necessary to prepare solutions of very low concentrations from a stock solution of higher concentration using a micropipet and a volumetric flask. What volume of a 0.0010 M solution of Zn(NO3)2 (aq) would be required to prepare a 5.0 nM solution of Zn2+ in a 250mL flask?
Solutions / Solvents |
Chemometrics
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Solutions : SolnPrepByMass (4 Variations)
You are required to prepare 5 L of a solution containing 1.000 x 10-3 mol/L of Cu2+(aq). Which of the following procedures would produce an appropriate solution?
Solutions / Solvents |
Chemometrics
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Reactions : StrongWeakAcidBase (10 Variations)
Which of the following are strong acids?
Acids / Bases
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Solutions : ConvertConcUnits (10 Variations)
The maximum concentration of arsenic in drinking water that is allowed by the EPA is 0.050 mg/L. Express this as a weight percent. (You can assume the density of the water solution is 1.0g/mL.)
Solutions / Solvents |
Nomenclature / Units / Symbols |
Chemometrics
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Solutions : GramsToMolalSoln (20 Variations)
How many grams of citric acid need to be added to 750 ml of ethanol to make a 0.50 m solution?
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Density (g/ml)
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Molecular Weight (g/mol)
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Citric acid
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1.665
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192.14
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Ethanol
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0.7893
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46.07
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Solutions / Solvents |
Nomenclature / Units / Symbols |
Chemometrics
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Solutions : MixturesMolcPics (11 Variations)
Which of the following combinations of substances corresponds to the molecular scale diagram shown below?
Solutions / Solvents |
Noncovalent Interactions |
Precipitation / Solubility
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Solutions : WtPercentToMolarity (4 Variations)
A common concentration unit used commercially is percent weight per volume (%W/V) which is the number of grams of solute in 100 mL of solution. A bottle of vinegar contains 5 %W/V acetic acid (CH3COOH). What is the molar concentration of acetic acid in the vinegar?
Solutions / Solvents |
Nomenclature / Units / Symbols |
Chemometrics
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Solutions : CalcMolarityFromPPT (10 Variations)
You are given a water sample to analyze from a lake contaminated with lead. It takes 24 mL of 0.020 M NaCl to exactly precipitate the Pb2+ ions from 61 mL of the water sample. What is the concentration of Pb2+ ions in the water?
Pb2+(aq) + 2NaCl(aq) PbCl2(s) + 2Na+(aq)
Solutions / Solvents |
Nomenclature / Units / Symbols |
Chemometrics
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Reactions : AcidBaseRxns (20 Variations)
In order to answer the following questions, write the net ionic equation for the reaction between equal volumes of 0.10 M solutions of the following acid and base:KOH(aq) + HBr(aq) What are the reaction products? Does the reaction yield an acidic, basic, or neutral aqueous solution?
Acids / Bases |
Reactions |
pH
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Acids_and_Bases : LewisAcidBaseRxns (19 Variations)
Identify the Lewis Acid and Base in the reaction of Ag+ and NH3 to form Ag(NH3)2+
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
Lewis Acids / Bases
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Aldehyde and Ketone Addition (2 Variations)
A collection of 2 assessment questions about Aldehyde and Ketone Addition
Aldehydes / Ketones |
Acids / Bases |
Reactions
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Acids_and_Bases : IonizationSteps (20 Variations)
Citric acid (which is a triprotic acid) has the following structure:
Which of the following equations corresponds to the first ionization step of the acid?
Acids / Bases |
Reactions |
Aqueous Solution Chemistry
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Acids_and_Bases : MolcScaleAcidBase (10 Variations)
Study the four drawings below and then decide which best represents an aqueous solution that has
(Water molecules are not shown in the diagrams.)
Acids / Bases |
Reactions |
Aqueous Solution Chemistry
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Acids_and_Bases : ConjugateAcidBase (20 Variations)
Identify the acid and base that are reactants and the conjugate acid and conjugate base that are products in the following equation:
HI(aq) + H2O(l)  H3O+(aq) + I-(aq)
Acids / Bases |
Reactions |
Aqueous Solution Chemistry
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Acids_and_Bases : HendersonHassel (20 Variations)
You may want to use the following acid/base table to answer the question below.
Papain is a thiol protease isolated from papaya. The optimal pH for its enzymatic activity is 6.0-7.0. Which of the following buffering systems would work best for a laboratory experiment requiring active papain at pH 6.5? What molar ratios of the compounds would you use to prepare the solution?
Acids / Bases |
Reactions |
Aqueous Solution Chemistry
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Acids_and_Bases : IDLewisAcidBase (20 Variations)
Which of the following is a Lewis acid?
Acids / Bases |
Reactions |
Aqueous Solution Chemistry
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Acids_and_Bases : ReactProductFavored (20 Variations)
You may want to use the following acid/base table to answer the question below. Which of the following reactions will be product -favored?
Acids / Bases |
Reactions |
Aqueous Solution Chemistry
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Acids_and_Bases : WeakStrongAcidPics (11 Variations)
Which diagram best represents an aqueous solution of HCl? (Water is not shown.) 
Acids / Bases |
Reactions |
Aqueous Solution Chemistry
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Acids_and_Bases : ChooseIndicator (8 Variations)
A 25.0 mL aliquot of a 1.44M solution of ammonia (Kb = 1.8 x 10-5) is titrated with 1.50M HCl. Use the Indicator Table below to decide which of the indicators listed would most accurately signal the equivalence point for this titration. 
Write the letter corresponding to your choice of indicator in the box.
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
pH
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Acids_and_Bases : SolnGrams (20 Variations)
How many grams of sodium hydroxide (NaOH) must be dissolved in 510 ml of water to make a solution with a pH = 8.1?
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
pH
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Acids_and_Bases : ProtonTransferRxn (20 Variations)
Write an equation to describe the proton transfer that occurs when the following acid is added to water: HSO4-
Enter the products in the space below using the following as an example:
What ions are present in an aqueous calcium nitrate solution?
Ca(NO3)2(aq) Ca2+(aq) + 2NO3-(aq)
In this case, the answer would be: Ca2+(aq) + 2NO3-(aq)
You should enter: Ca^(2+) + 2NO3^(-)
In other words, use the ^ to indicate superscripts; put charges in parentheses; and leave a space on either side of the + sign. Your answer must be an exact match for the computer to grade it correctly, so be careful.
What products will result when HSO4- is added to water?
Acids / Bases |
Reactions |
Aqueous Solution Chemistry
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AcidBaseProducts (10 variations)
The following acid/base table may be useful in answering the question below. What products will result when HSO4- is added to water? Complete and balance the reaction below. HSO4- + H2O ?
Acids / Bases |
Reactions |
Aqueous Solution Chemistry
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Acids_and_Bases : AcidBaseProperties (10 Variations)
Which of the following are properties of HCl?
Acids / Bases |
Reactions |
Aqueous Solution Chemistry
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Acids_and_Bases : AcidicOrBasicSalt (20 Variations)
When dissolved in an aqueous solution, which of the following salts will yield an acidic solution?
Acids / Bases |
Reactions |
Aqueous Solution Chemistry
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Acids_and_Bases : PercentDissociationKa (3 Variations)
Calculate the percent dissociation in a {x}M aqueous solution of the weak acid HA. (Ka = {y} x 10-4)
Enter your answer to ONE decimal place.
DO NOT use scientic notation.
DO NOT write in the units.
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
Equilibrium
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Acids_and_Bases : TitrationCurveKaKb (8 Variations)
Study the graph of the titration of a weak acid with a strong base shown below. What is the approximate Ka for this acid? 
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
Titration / Volumetric Analysis
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Acids_and_Bases : PracticalAcidBase (20 Variations)
Which of the following statements is true?
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
Physical Properties
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Acids_and_Bases : WaterAutoIonization (20 Variations)
What effect will the addition of H2CO3 have on the autoionization of water?
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
Water / Water Chemistry
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Acids_and_Bases : WeakAcidSolnpH (20 Variations)
Given an aqueous solution of 0.30 M acetic acid (Ka = 1.8 x 10-5), the pH is approximately ...
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
pH |
Equilibrium
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Acids_and_Bases : BufferingCapacity (20 Variations)
If a buffer is prepared using 0.75 mol CH3COOH and 0.45 mol CH3COO- in 1 liter of aqueous solution, is the buffering capacity of the solution great enough to maintain its pH if 10 g NaOH is added?
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
pH |
Equilibrium
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Acids_and_Bases : pHDilution (6 Variations)
What is the pH of a solution made by diluting {x} mL of {y} M HNO3(aq) to a total volume of 500 mL?
Enter your answer to two decimal places.
DO NOT use scientific notation
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
pH |
Equilibrium
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Acids_and_Bases : pHBufferCalc (4 Variations)
Calculate the pH of a buffer solution containing {x}M NH3 and {y}M NH4NO3.
Enter your answer to TWO decimal places.
DO NOT use scientific notation.
DO NOT enter units
eg: 4.55
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
pH |
Equilibrium
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Acids_and_Bases : BufferWeakStrong (7 Variations)
How many mL of a 2.50 M HCl solution must be added to 500 mL of a 0.150 M CO32- solution to make a buffer with pH = 10.00?
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
pH |
Equilibrium
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Acids_and_Bases : CalcSolnpH (5 Variations)
Use this acid/base table to answer the question below.
Calculate the pH of a {x}M sodium acetate solution.
DO NOT use scientific notation
Enter your answer to two decimal places.
DO NOT enter units
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
pH |
Equilibrium
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Acids_and_Bases : BufferWeakWeak (14 Variations)
What mass of potassium bicarbonate (KHCO3) must be added to 500 mL of a 0.200 M carbonic acid solution to make a buffer with pH = 6.30?
Acids / Bases |
Reactions |
Aqueous Solution Chemistry |
pH |
Equilibrium
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Acid Base (44 Variations)
A collection of 44 assessment questions about Acid Base
Acids / Bases |
Carboxylic Acids |
Alcohols |
Phenols |
Reactions |
Alkanes / Cycloalkanes |
Aldehydes / Ketones |
Esters |
Alkenes |
Alkynes |
Amines / Ammonium Compounds |
Ethers |
Lewis Acids / Bases |
Amides |
Amino Acids
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Aldol Reactions (30 Variations)
A collection of 30 assessment questions about Aldol Reactions
Aldehydes / Ketones |
Esters |
Amides |
Carboxylic Acids |
Mechanisms of Reactions |
Acids / Bases |
Reactions |
Synthesis |
Elimination Reactions |
Resonance Theory
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Amino Acids (10 Variations)
A collection of 10 assessment questions about Amino Acids
Amino Acids |
Stereochemistry |
Acids / Bases |
Amines / Ammonium Compounds |
Carboxylic Acids |
Nucleic Acids / DNA / RNA |
Proteins / Peptides |
Synthesis |
Aldehydes / Ketones
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Carboxylic Acids (14 Variations)
A collection of 14 assessment questions about Carboxylic Acids
Carboxylic Acids |
Acids / Bases |
Esters |
Amides |
Reactions |
Synthesis |
Grignard Reagents |
Ethers |
Oxidation / Reduction |
Alkenes |
Heterocycles |
Amines / Ammonium Compounds |
Aldehydes / Ketones
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Covalent Bonding (11 Variations)
A collection of 11 assessment questions about Covalent Bonding
Carboxylic Acids |
Acids / Bases |
Resonance Theory |
Covalent Bonding |
Phenols |
Amines / Ammonium Compounds |
Free Radicals |
Alkenes |
Amides |
Ethers
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Phenols and Aryl Halides (9 Variations)
A collection of 9 assessment questions about Phenols and Aryl Halides
Phenols |
Acids / Bases |
Reactions |
Alcohols |
Amines / Ammonium Compounds |
Carboxylic Acids |
Aromatic Compounds |
Ethers |
Alkylation |
Synthesis |
Esters |
Electrophilic Substitution
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Amines (30 Variations)
A collection of 30 assessment questions about Amines
Amines / Ammonium Compounds |
Synthesis |
Acids / Bases |
Reactions |
Amides |
Electrophilic Substitution |
Stereochemistry |
Carboxylic Acids |
Oxidation / Reduction |
Aldehydes / Ketones |
Alkanes / Cycloalkanes |
Dyes / Pigments |
Grignard Reagents
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Bonding (34 Variations)
A collection of 34 assessment questions about Bonding
Molecular Properties / Structure |
Covalent Bonding |
IR Spectroscopy |
VSEPR Theory |
Aromatic Compounds |
Lewis Structures |
Resonance Theory |
Aldehydes / Ketones |
Carboxylic Acids |
Acids / Bases
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Organometallic (13 Variations)
A collection of 13 assessment questions about Organometallic
Organometallics |
Grignard Reagents |
Epoxides |
Alcohols |
Esters |
Alkanes / Cycloalkanes |
Aldehydes / Ketones |
Synthesis |
Ethers |
Aromatic Compounds |
Reactions |
Carboxylic Acids |
Alkenes |
Amines / Ammonium Compounds |
Acids / Bases |
Alkynes
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